How SMS Marketing Works for Small Businesses: The Numbers, the Mistakes, and What I'd Do Differently

The short version: SMS marketing works by getting a customer's mobile number with proper consent, then sending short, timed, offer-led texts through a platform like SimpleTexting, TextMagic, or Klaviyo's SMS add-on, and it earns its keep through open rates near 90-98% and click rates that beat email by a wide margin, but only if you send rarely, write tightly, and follow the consent rules to the letter.

Worth reading next: Weekly Marketing Routine for Small Business: A Practical Plan.

What SMS marketing looks like day to day

Strip away the jargon and SMS marketing is just this: you collect a phone number with permission, you load it into a platform, and you send a text that says something worth reading in under 160 characters. That's it. No design, no subject line tricks, no algorithm to fight. The whole channel lives or dies on one thing, whether the text is worth the buzz in someone's pocket.

Compare that to email, where you're competing with 120 other unread messages, or Instagram, where the platform decides who sees your post at all. A text message goes straight to a lock screen. There's no gatekeeper. That's the entire appeal, and it's also why it's so easy to ruin.

The numbers that make people care

Here are the figures worth knowing before you spend a penny:

• Open rates on SMS sit between 90% and 98%, according to figures from Attentive and SimpleTexting, compared with 15-25% for a decent email list.
• Click-through rates on SMS typically land between 19% and 36%, versus 2-5% for email.
• A single text through a platform like TextMagic or ClickSend costs somewhere between 3p and 8p in the UK, depending on volume and whether you're sending from a shared or dedicated number.
• Most small business platforms charge a base fee too, usually £15 to £40 a month, plus the per-message cost on top.
• Opt-out rates jump sharply after the third text in a month. I've seen client lists lose 4-6% of subscribers in a single week when the sending pace crept up from weekly to three times a week.

The 98% open rate figure gets thrown around a lot, and it's true, but it's also slightly misleading. It measures whether the notification appeared, not whether anyone read past the first line or cared. I'd rather quote you the click rate, because that's the number that pays your bills.

A real example from a client's shop

I worked with a small homeware boutique in the Cotswolds, an independent shop with around 800 people on their SMS list, built up over eighteen months through in-store sign-up cards and a checkbox at checkout on their website. Nothing clever, just genuine consent, collected.

For a bank holiday weekend sale, we sent one text on the Friday morning: "Bank holiday sale starts now, 20% off everything in store and online this weekend only, reply STOP to opt out." That was it. No emoji pile-up, no fake urgency countdown.

Of the 800 recipients, 612 opened it within the first hour (we could see this through link clicks and in-store redemptions), and 94 people used the code online within 48 hours, with another 61 mentioning it in person at the till. Total revenue from that single text, once we tracked both online and in-store redemptions, came to just over £4,100. The text itself cost about £48 to send. That's the kind of return that makes a small business owner sit up, and it's the reason I keep recommending SMS to clients who'd normally only think about Instagram or email.

But here's the part people leave out of these success stories: that same shop tried sending twice a week for a month afterwards, thinking more texts meant more sales, and lost 71 subscribers in four weeks. The novelty wore off fast, and a channel that felt like a treat became one that felt like nagging. We pulled back to twice a month and the list stabilised.

Setting it up, step by step

This is the practical bit, the actual sequence I'd walk a small business owner through.

1. Get consent the right way

You need explicit opt-in, not a number you scraped from an invoice or a business card. A checkbox at checkout, a sign-up card in store, or a keyword text-in campaign ("Text SAVE to 82323 for offers") all count as clean consent. Silence is not consent. Neither is "we'll assume you're happy unless you tell us otherwise."

2. Pick a platform that matches your size

For under 1,000 contacts, something like SimpleTexting, TextMagic, or EZ Texting will do everything you need, with plans starting around £20-£30 a month. If you're already using Klaviyo for email, their SMS add-on is worth a look since it shares your existing customer data and segments. Bigger UK-focused options like TextAnywhere and txtNation are worth a look if you need dedicated short codes or higher volume sending.

3. Segment before you send anything

Don't blast your whole list with everything. Split by purchase history, location, or how they signed up. A customer who bought once six months ago needs a different message to one who buys every month.

4. Write short and write for a phone screen

Keep it under 160 characters where you can, always include what's in it for them in the first ten words, and always include an opt-out line. I sometimes draft ten variations of a text using AI prompts and cut it down from there, the same approach I cover in these ChatGPT prompt ideas for small business emails, which work just as well shortened down for SMS.

5. Time it

Data across most SMS platforms points to late morning (10am to noon) and early evening (5pm to 7pm) as the strongest windows. Avoid before 8am and after 9pm, both for response rates and because several countries, the UK included, have rules against marketing texts outside those hours.

6. Track redemptions, not just sends

Use a unique discount code or a trackable link for every SMS campaign so you know what converted, not just what got delivered.

The compliance bit nobody enjoys but everyone needs

In the UK, SMS marketing falls under the Privacy and Electronic Communications Regulations (PECR), enforced by the Information Commissioner's Office. You need clear, specific consent before sending marketing texts, you must identify your business in the message, and you must offer an easy opt-out every time. Fines for breaches have run into six figures for UK companies that got this wrong. In the US, the equivalent is the Telephone Consumer Protection Act (TCPA), which carries penalties of $500 to $1,500 per text sent without proper consent, and that adds up fast if you've sent to a list of a few thousand.

The practical takeaway: never buy a list, never add numbers from old invoices without asking, and keep a dated record of exactly when and how someone opted in. If a client ever queries a text, you need to be able to show that record within minutes, not dig through spreadsheets for a week.

Why some businesses quit SMS after three months

Here's the part most guides skip. SMS marketing isn't loved by customers, it's tolerated, and only up to a point. People don't sign up because they want a relationship with your brand in their text inbox, they sign up because they want a discount code eventually. That's a transactional deal, not a loyal one. Treat it like email, where you can afford to send a friendly weekly newsletter building a relationship, and you'll burn through goodwill in weeks.

I've also seen small business owners underestimate the labour cost of running SMS well. Replies come in. People text back asking questions, complaining, or trying to negotiate a bigger discount, and if you don't have someone monitoring that inbox, you look like you're ignoring customers who reached out directly. One client of mine ended up answering texts from her phone at 9pm because she hadn't planned for the reply volume. That's not a technology problem, it's a staffing one, and it's worth thinking through before you launch, not after.

SMS also works far better for businesses with something urgent or discount-shaped to say, sales, appointment reminders, restock alerts, than for businesses trying to build a brand or educate an audience. If your business is built on thought leadership or slow-burn trust, put that effort into content and email instead, and save texts for the moments that need speed.

When SMS is worth it and when it isn't

SMS earns its place for:

• Appointment reminders (salons, clinics minus health content, garages, trades)
• Flash sales and time-limited offers
• Restock alerts for products that sell out
• Abandoned cart nudges for ecommerce, sent a few hours after the drop-off
• Event reminders and last-minute changes

It's a weaker fit for businesses selling high-consideration services, where trust is built over months, not minutes. If that's you, your energy is better spent on the channels I've written about before, whether that's the Instagram tools I pay for to build a visual following, or checking what you can legally learn from a competitor's marketing before you decide SMS is even the right channel for your industry.

What it costs to run

For a small business with 500 to 2,000 subscribers, expect to pay:

• £20-£40 a month platform fee
• 3p-8p per text sent, so a single campaign to 1,000 people costs roughly £30-£80
• Optional dedicated short code, which some UK providers charge £30-£75 a month for, useful once you're sending high volumes and want faster delivery

Run two campaigns a month to a list of 1,000, and you're looking at roughly £150-£250 a month all in, platform fee included. Set against the boutique example above, where one text generated over £4,000, the maths tends to work in your favour quickly, provided you don't send so often that people opt out before they ever buy again.

If budget is tight and you're weighing SMS against other marketing spend, it's worth reading through how to use AI for small business marketing on a budget, since a lot of the copywriting and segmentation work behind a good SMS campaign can be sped up with the right prompts rather than paid tools you'll open twice and forget.

This guide is part of my AI for Small Business: 25 Plain-English Guides to Automation, Marketing, Sales and Admin.

Related: writing for us on mobile technology.

A closely related walkthrough: How Niche Businesses Can Use Email Marketing to Reach the Right Customers.

Frequently asked questions

How many text subscribers do I need before SMS marketing is worth it?

You can start seeing a return with as few as 200-300 opted-in subscribers, since the cost per text is so low that even a modest 5-8% conversion rate covers the spend. The bigger factor than list size is consent quality, a small list of engaged, opted-in customers will always outperform a large list of people who barely remember signing up.

Is SMS marketing legal without explicit written consent?

No. In the UK, PECR requires clear, specific consent before you send marketing texts, and in the US the TCPA sets similar requirements with penalties of $500 to $1,500 per unauthorised message. A checkbox at checkout, a sign-up form, or a keyword opt-in text are all valid, but a number pulled from an invoice or old customer record is not.

How often should a small business send marketing texts?

Twice a month is a safe starting pace for most small businesses. Weekly can work for retail during peak seasons, but expect opt-out rates to climb, and anything more than twice a week tends to trigger noticeable unsubscribes within a month, based on what I've seen across client campaigns.

What's the difference between SMS marketing and email marketing for a small business?

SMS gets read almost immediately, with open rates near 90-98% versus 15-25% for email, but it demands brevity, costs more per send, and tolerates far less frequency before people opt out. Email is better for building a relationship over time with longer content, while SMS is best kept for short, urgent, offer-led messages.

Useful references

• the UK Information Commissioner's guidance on direct marketing